package com.atguigu.eduservice.service.impl;

import com.atguigu.eduservice.entity.EduChapter;
import com.atguigu.eduservice.entity.EduVideo;
import com.atguigu.eduservice.entity.chapter.ChapterVo;
import com.atguigu.eduservice.entity.chapter.VideoVo;
import com.atguigu.eduservice.mapper.EduChapterMapper;
import com.atguigu.eduservice.service.EduChapterService;
import com.atguigu.eduservice.service.EduVideoService;
import com.atguigu.servicebase.exceptionHandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author atguigu
 * @since 2024-12-09
 */
@Service
public class EduChapterServiceImpl extends ServiceImpl<EduChapterMapper, EduChapter> implements EduChapterService {
    @Autowired
    private EduVideoService videoService;//注入小节service
//课程大纲列表，根据课程id进行查询
    @Override
    public List<ChapterVo> getChapterVideoByCourseId(String courseId) {
        //根据课程id查询课程里面所有章节
        QueryWrapper<EduChapter> WrapperChapter = new QueryWrapper<EduChapter>();
        WrapperChapter.eq("course_id",courseId);
        List<EduChapter> eduChapterList = baseMapper.selectList(WrapperChapter);

        //根据课程id查询课程里面所有的小节
        QueryWrapper<EduVideo> WrapperVideo = new QueryWrapper<>();
        WrapperVideo.eq("course_id",courseId);
        List<EduVideo> eduVideoList = videoService.list(WrapperVideo);

        List<ChapterVo> finalList=new ArrayList<>();

        //遍历查询章节list集合进行封装
        for (int i = 0; i < eduChapterList.size(); i++) {
            //每个章节

            EduChapter eduChapter = eduChapterList.get(i);
            ChapterVo chapterVo = new ChapterVo();
            BeanUtils.copyProperties(eduChapter,chapterVo);
            finalList.add(chapterVo);

            //创建集合，用于封装章节的小节
            List<VideoVo> videoList=new ArrayList<>();
            for (int j = 0; j < eduVideoList.size(); j++) {
                EduVideo eduVideo = eduVideoList.get(j);
                //判断 小节里面的chapterid和章节里面的id是否一样
                if(eduVideo.getChapterId().equals(eduChapter.getId())){
                    //进行封装
                    VideoVo videoVo=new VideoVo();
                    BeanUtils.copyProperties(eduVideo,videoVo);
                    //放到封装到小节集合
                    videoList.add(videoVo);
                }
            }
            //把封装之后的小结list，放到章节对象中
            chapterVo.setChildren(videoList);


        }
        //遍历查询小结list集合进行封装
        return finalList;
    }
    ////删除章节的方法
    @Override
    public boolean deleteChapter(String chapterId) {
        //根据chapterid章节id 查询小节表，如果查询数据，不进行删除
        QueryWrapper<EduVideo> wrapper = new QueryWrapper<>();
        wrapper.eq("chapter_id",chapterId);
        int count = videoService.count(wrapper);
        //判断
        if(count >0) {//查询出小节，不进行删除
            throw new GuliException(20001,"不能删除");
        } else { //不能查询数据，进行删除
            //删除章节
            int result = baseMapper.deleteById(chapterId);
            //成功  1>0   0>0
            return result>0;
        }
    }
    //根据课程id先删除章节
    @Override
    public void removeChapterByCourseId(String courseId) {
        QueryWrapper<EduChapter> wrapper = new QueryWrapper<>();
        wrapper.eq("course_id",courseId);
        baseMapper.delete(wrapper);
    }

}
